他是中国力学科学的奠基人 和空气动力研究的开拓者 也是以烈士身份被追授 "两弹一星"功勋奖章的科学家 他是郭永怀 57年前的今天 1968年12月5日 郭永怀带着一份核武器的绝密资料 匆匆乘飞机从青海基地赶往北京 飞机不幸坠毁 找到遗体时 一起以相同的最高分数 在场的人无不失声痛哭 郭永怀与警卫员紧紧地抱在一起 费了很大力气将他们分开后 那个装有绝密资料的公文包 就夹在俩人中间 数据资料完好无损 1938年 中英庚子赔款基金会留学委员会 第七届留学生招生考试 郭永怀与钱伟长、林家翘 同时被力学专业录取 年轻时的郭永怀（资料照片）。新华社发 1940年 郭永怀一行赴加拿大的 多伦多大学应用数学系学习 次年 郭永怀来到美国加州理工学院 和钱学森一起师从 世界气体力学大师冯·卡门 1945年郭永怀博士毕业 来到康奈尔大学任教 郭永怀的研究 为人类实现超音速飞行 做出了重要贡献 郭永怀（左）与夫人李佩（资料照片）。新华社发 1956年9月底 郭永怀携全家动身归国 回国后长期主持 中科院力学研究所的工作 与钱伟长一起创办了 清华大学力学研究班 郭永怀（左）和郑哲敏在力学所。新华社发 1958年 郭永怀参与创建的 中国科 ...

Core Viewpoint - NASA and Lockheed Martin successfully completed the first flight of the experimental quiet supersonic aircraft X-59, which aims to address noise issues associated with supersonic flight over land [2] Group 1: Aircraft Specifications and Performance - The X-59 is approximately 30 meters long with a wingspan of about 9 meters, designed to cruise at a speed of 1.4 Mach [2] - The aircraft's unique shape and noise reduction design significantly diminish the sound of sonic booms reaching the ground [2] Group 2: Development Goals and Future Implications - The X-59 aims to overcome the primary barrier to supersonic commercial flight over land, which is the noise problem [2] - The development and flight testing of the X-59 will lay the groundwork for the next generation of supersonic aircraft, which are expected to transport passengers and cargo at twice the speed of current commercial jets efficiently and sustainably [2] Group 3: Industry Impact - NASA's acting administrator, Sean Duffy, stated that the X-59 showcases the vitality of American aviation innovation, reinforcing the U.S.'s leading position in the aerospace sector and potentially transforming future flying experiences for the public [2]

Core Viewpoint - NASA and Lockheed Martin successfully completed the first flight of the experimental quiet supersonic aircraft X-59, marking a significant step in overcoming noise issues associated with supersonic commercial flight [1] Group 1: Aircraft Specifications and Performance - The X-59 is approximately 30 meters long with a wingspan of about 9 meters, designed to cruise at a speed of 1.4 Mach, which is 1.4 times the speed of sound [1] - The aircraft's unique shape and noise reduction design significantly diminish the sound of sonic booms reaching the ground [1] Group 2: Development and Future Implications - The X-59 aims to address the primary obstacle that currently limits supersonic commercial aircraft from flying over land, which is the noise issue [1] - The development and flight testing of the X-59 will lay the groundwork for the next generation of supersonic aircraft, which are expected to transport passengers and cargo at twice the speed of current commercial jets efficiently and sustainably [1] Group 3: Industry Impact - NASA's acting administrator, Sean Duffy, highlighted that the X-59 showcases the vitality of American aviation innovation, reinforcing the country's leading position in the aerospace sector and potentially transforming future flying experiences for the public [1]

Core Viewpoint - U.S. airline stocks continue to rise in pre-market trading, with Joby Aviation up 11.3% and Archer Aviation up 12.7%, following President Trump's signing of an order to strengthen U.S. drone defense and promote supersonic flight [1] Company Summary - Joby Aviation's stock increased by 11.3% in pre-market trading [1] - Archer Aviation's stock rose by 12.7% in pre-market trading [1] Industry Summary - The signing of an executive order by President Trump aims to enhance U.S. drone defense capabilities [1] - The order also seeks to promote the development and use of supersonic flight technology [1]

Core Points - Trump signed multiple executive orders to enhance U.S. airspace sovereignty and aviation safety [1] - The orders aim to advance the development of electric air taxis and allow advanced drone operations [1] - The executive orders also focus on strengthening national cybersecurity and directing the federal government to promote secure software development [1] - The initiatives are designed to ensure U.S. leadership in drone research, commercialization, and export [1] - The orders promote the development of supersonic aviation, including the directive to the FAA to lift the ban on supersonic flight over land [1] - The FAA is instructed to establish temporary noise certification standards for supersonic aircraft, considering community acceptability, economic feasibility, and technical viability [1]